In elements of second period give reason for difference in proper… - Vidyadip

Question

In elements of second period give reason for difference in properties of Li and Be .

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Answer

The properties of Li and Be are different from other members of their group and they show more similarity in their properties with the diagonally located elements i.e. Mg and Al , this is called diagonal relationship. The reasons for this are as follows :
(i) Small size of elements
(ii) High electronegativity
(iii) High charge/radius ratio
(iv) Absence of $d$-orbitals in the valence shell.

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